body {
    position: relative;
}

html, body {
    height: 100%;
    width: 100%;
}

.content_body {
    width: 100%;
    height: 100%;
    background: url(../image/bigTvBG.jpg) no-repeat center center;
    background-size: 100% 100%;
    /*background: palevioletred;*/
    position: relative;
    overflow: hidden;
    /*overflow: auto;*/
    /*-webkit-overflow-scrolling: touch*/
}

.bigTVlogo {
    width: 15%;
    height: auto;
    margin-top: 2vh;
    margin-left: 2%;
    cursor: pointer;
}
.indexMaImg{
    width:15%;
    height: auto;
    margin-top: 10px;
    margin-left: 2%;

}
.start{
    width: 5vw;
    height:3vw;
    background-color: yellow;
    color: white;
    font-size: 24px;
    margin-left: 47.5%;
    margin-top: -60px;
    text-align: center;
    line-height: 3vw;
    letter-spacing: 2px;
    border-radius: 0.5vw;

}

#main{
    width: 75vw;
    height: 75vh;
    /*background: gold;*/
    position: absolute;
    left:20vw;
    right:0;
    top:20vh;
    bottom: 0;
    margin: auto;

}